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# SSL certificate authority invalid error on .vercel.app domains

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crynxmartinez (@crynxmartinez-2479) · 2026-03-07

I’m experiencing SSL certificate errors across **all** my Vercel projects that use `.vercel.app` domains. This started happening a few hours ago and affects:

- Multiple projects (`university-client-theta.vercel.app`, `university-server-fawn.vercel.app`, and others)
- Multiple devices (different laptops and PCs)
- All browsers

## Current Behavior
I see the following error:

> **Error: `NET::ERR_CERT_AUTHORITY_INVALID`** - “Your connection is not private”

## What I’ve Tried
- Redeploying projects
- Removing and re-adding domains
- Testing on different devices and networks
- Changing `DNS` servers
- Flushing `DNS` cache

## Additional Context
**Workaround:** Using `VPN` allows me to access the sites, but without `VPN`, all `.vercel.app` domains show SSL errors.

**Expected behavior:** Sites should load normally with valid SSL certificates like they did yesterday.

Is this a known issue? Are others experiencing this? Any ETA on a fix?